I recently had to change the default sending domain and remove the previous default sending domain. I rekey the the ssl cert and it has been issued to the new domain name. The issue i am having is all of our existing and newly created outlook profiles get an ssl certificate error message and the old domain name is displayed but when i go the Subject alt names i see the new domain name and it is issues to the right organization. Also, everytime i create a new outlook profile, i see that the url to connect to owa is the old address. Please let me know if you need more clarification.